Automatic balancing mechanism.



A. B. LANDIS. AUTOMATIC BALANCING MECHANISM.

APPLICATION FILED FEB. 7, 1910.-

' Patented Mar. 31, 1914;

5 SHEETS-SHEET 1.

I6 I M 5 II 5 *I HZ Ti J m 9 V A /'/z LVVENTOR.

A. B. LANDIS. AUTOMATIC BALANCING MECHANISM.

' APPLICATION FILED ran. 7, 1910.

Patented Mar. 31, 1914 6 SHEETS-SHEET 2;

Lowm. I

IVITNESSES:

I IIVVENTOR.

- A. B. LANDIS.

AUTOMATIC BALANCING MECHANISM.

APPLICATION FILED FEB. "l, 1910.

1,09 1 851 a Patented Mar. 31, 1914.

5 SHEETS-SHEET 3.

I q R [NVE N T OR.

WITNESSES.-

A. B. LANDIS.

AUTOMATIC BALANCING MECHANISM.

APPLIGATION FILED FEB. 7, 1910.

Patented Mar. 31, 1914 5 SHEETS-SHEET 4.

IVITNESSES:

ATTORNEY A. B. LANDISf AUTOMATIC BALANCING MECHANISM. APPLICATION FILED FEB. 7, 1910.

9 g51 u Patented Maw. 31, 1914 4 6 SHEETS-831E135.

IVITNESSES: v INVENTOR.

i showin ABRAHAM B. LANDIS, or WAYNESBORO, PENNSYLVANIA.

AUTOMATIC BALANCING MECHANISM.

meanest To all whom it may concern Be it known that I, ABRAHAM B. LANDIS, a citizen of the United States residing at \Vaynesboro, in the county of Franklin and State of Pennsylvania, have invented oer tain new and useful Improvements in Automatic Balancing Mechanism, of which the following is a specification.

In the use of machines for dressing surfaces employing an emery, or grinding wheel, such as grinding machines, it is of importance that the emery wheel itself, as well as the other parts of the mechanism, shall be perfectly true and exactly balanced so as to run Without any waver, chatter or vibration andthus insure a perfectly true finished surface when the work is complete, In common construlctions of grinding wheels it has been found difficult to obtain a perfectly true and accurately balanced wheel the result being attained only after considerable and rather expensive work.

The object of my said invention is to construct a wheel center, orframe, for carrying the .emery wheel proper andprovide an apparatus to cooperate therewith for truing and balancing the same which will secure the desired result positively and accurately and also in an automatic manner, all as will be hereinafter more fully described and claimed.

Referring to the accompanyin drawings which are made a part hereof an on which similar reference characters indicate similar parts, Figure .1 is a vertical section through theautomatic truing and balancing machine the grindin wheel in the posit-ion which it occupies wliilethe work is being done, Fig. 2 a view partly in top plan and partly in horizontalsection as seen when looking downwardly from the dotted line 1-2 in Fig. 1, Fig. 3 a detail view of a part of the stand of the machine as seen when looking in the direction indicated by the arrows from the. dotted line 3-3 in Fig. 2, both the top and lower portions of the machine being broken away, Fig. 4 a

top or planview of'one edge of the top of the standshowin the diamonding tool for truing the face .0 the grinding W-heel thereon in position for use, Fig. 5 a detail section' on the dotted 1ine,55 in Fig. 4, Fig. 6. a central transverse section through the grinding wheel center, or frame, and a portion of the grinding wheel the outer part thereof being broken away in order to show Specification of Letters Patent.

Patented Mar. 3t, 3914.

Application filed February 7, 1910. Serial No. 542,465.

the central portion of the wheel on a large scale, Fig. 7 an outside-plan view of the wheel showing a part of the outside plate Fig. 8, and Figs. 10 and 11 details showing an end and face view respectively ofv the adjusting nut or block.

In said drawings the portions marked A represent the stand, or frame, of the balancin machine, B the frame of the diamondmg tool and O the frame or center of the grinding wheel. The machine comprises the stand A which is a hollow vertical casting of appropriate dimensions formed with a suitable base a and with a top A which is bowl-shaped and of suflicient size to surround the emery wheels which are to be dressed therein, the sides extending up a sufiicient distance to protect the operator against the flying grit 'and water while the face of the wheel is being dressed. It is also burst during the operation. Said top A is .mounteddirectly upon the top of the stand A being preferably formed with a central perforation of appropriate size to slide over said top and rest upon a shoulder near the upper end thereof as shown most clearly in Fig. 1. A sleeve 2 is mountedto slide in the upper end of said stand and project to within said top A the upper end of said sleeve being formed with a circular recess in which is mounted an annular bearing plate 3 in which is formed an annular bearing groove 4 for. a purpose to be presently de scribed. The interior face of said sleeve, at its lower end, is formed tapered, as shown. A spindle 5 having a driving pulley 6 near its lower end is mounted in suitable bearings 7 and 8 on either side of said pulley. Said spindle is formed in two parts its upper end being connected to its lower end by a universal joint 9 for a purpose to be presently described. Another bearing 10 is mounted on the upper part of spindle 5 being normally adapted to rest on the top surface of a collar 11, which is rigidly secured to said spindle 5 by a set screw 12.

"Said bearing 10 has a circumferential flange 13 the outer edge-of which is formed with its inner end in a circumferential groove 7- which is formed in the outer face of bearing 10 near its lower end. The sleeve 2 has screws, or bolts, 16 inserted in its sides dia- I metrically opposite each other which project through slots .9 in the sides of stand A and engage with the inner ends of the respective branches of a bifurcated lever 17, which is mounted on pivots 18, which extend into the opposite sides of the stand A near its outer edge. By this arrangement sleeve 2 may be slid downward so that its tapered face will engage the tapered face of flange 13 of bearing 10, or said bearing 10 may be slid upward to effect the engagement, as may be preferred, and for a purpose to be hereinafter described. V

The diamonding tool frame B consists of aswinging arm pivoted at one end on a pivot 20 to an ear a on one side of the top Its opposite end is provided with a guiding and clamping bolt 21 which engages with a segmental slot 8 formed in an outwardly projecting arm a on the same side of the top A but at a point on the opposite side of the axis of the spindle. Said arm B is formed with a handle 15 .by which a the operator may hold. the same to carry the diamonding tool in contact with the.

face of the grinding heel, or it may be clamped in position t do the work by the bolt 21; At a point in line with the axis of the wheelto be dressed said arm A is provided with a vertical socket B in which is mounted a sliding bar I) which projects through said socket and carries near its outer endthe dianfond supporting block b. 'A screw B engages with a screw-threaded perforationin the outer end of the bar 7) and is mounted "to tu in the outer end of the socket B, being p vided with a crank wheel onits' outer end by which the operator may rotate said screw and thus slide said bar to traverse the diamond back and forth acrossthe face of the wheel, as may be desired, the tool being held to the face of the diamondinglwheel with the other hand by means of the handle 15, or secured by the screw 21, as before described.

The grinding wheel center 0 is a cast metal diskof appropriate dimensions and is provided with an annular flange 0 near its outer edge leaving a seat on the outer face of said flange for the inner edge of the, an-

nular emery wheel 0', which is clamped in.

place by an annular clamping ring 0 and clamping bolts a. In the center of said disk C is formed a hub 0 having a conical opening or hearing adapted to be seated upon a correspondingly'shaped arbor, both on the balancing machine and on the grinding machine; While I have shown a conical hearing and aconical arbor to receive the same it will be understood that this is only a preferredform. Between the annular flange 0 near the outer edge of center C and the hub c at its center is mounted an annular radially adjustable balancing ring 25 and to the outer faceof the flange cfand hub 0 is secured a plate or cover 26 which is secured in place by screws 27 inserted through said plate or cover near its edge into screwdotted line at (Z on one side to the dotted line d on the opposite side of the wheels, as shown in Fig. 7. Blocks or nuts 28 of substantially the form of segments of said ring are mounted in said recess and secured on said ring by means of an interengaging tongue and groove, the tongue being shown as formed on each block 28 and engaging with a groove in the ring 25, said tongue being indicated in Figs. 6, 10 and 11 by thereference letter t. The tongueand-groove connection between the blocks 28 and the balancing ring 25 isas best indicated by dotted lines in Fig. 7 the groove for the engagement-of one block extending in a line exactly at right angles with the groove for the engagement of the other block. '9 Each of said blocks 28 is formed with a transverse.

screw-threaded perforation and a screw 30 is mounted in said-perforation in each block,

being seated at itsouter end in a suitable seat 31 in the flange c and at its inner endin a suitable seat formed in the hub 0?. Said seats 31 are preferably suitable collars, or

screw-plugs, with an appropriate seat and formed, with exterior screw-threads and screwed into perforations formed in said flange. A worm wheel 32 is mounted on each of said screws 30 and engages with a thread on a screw-shaft 33 which is'mounted at its inner end in ajournal in one side of 7' the hub c and at its outer end extends through the plate C and is provided with a friction wheel or' roller 34 onits outer end. A screw 35 is-tapped into the inner end of said screw-shaft 33 the head of said screw 35 forming .a shoulder between which and the shoulder on the outer end adjacent to the wheel 34 said shaft is held to rotate in itsjournals. The central portion of said screw-shaft is threaded, as shown. -The ar rangement of the two blocks 28 and the means for operating them is identical ineach instance except that one is arranged at right angles with the other. It thus be seen that the rotation of one screw 30 by the turning of the appropriate screw-shaft 33 will move that block 28 with which it engages in line with the radius of the wheel 5 and carry with it the balancing ring 25 which is connected therewith by the tongueand-groove connection. As one block 28 carrying the rin 25 moves in one direction said ring 25 sli es on the other block 28, as one tongue-and-groove connection is at right angles with the other tongue-and-groove connection. It will thus be seen that the turning of screws 30 is adapted to carry the balancing ring in any direction in relation to its axis necessary to balance the wheel.

In operation, a grinding wheel of the form shown in Figs. 6, 7 and 8 is put into the tool, or machine, shown in Fig. l, for the purpose of truing and balancing the same, by placing the conical bearing in the hub over the taperedarbor on the topof spindle 5. The frictional cont-act will be suflicient to cause said Wheel to rotate with. said arbor. The plate 26 is loosened to leave ring 25 free'to slide. The wheels 34 on the screw-shafts 33 are adapted to just fit withm the annular groove 4 in the bearing late 3 on the upper end of sleeve 2. The s eeve 2 1S sl1d downward until its inner tapered face 1m mges against the outer tapered face of the ange 13 on the bearing 10, or bearing 10 s slid upward'to secure the en agernent, which holds said bearing 10 rigidly to said sleeve and thus affords a rigid bearing with- 111 which the upper end of spindle may run, so as to avoid any vibration and hold the work (the grinding wheel} steady on its arbor. The diamonding tool shown inFigs. 4 and is then brought, into position so that the point of the diamond will touch the face of the wheel and is held in this position while the operator turning crank 11 traverses sa ddiamond point back and forth across said face until the face is dressed perfectly 45 true. The diamonding tool is then run up to carry the lower end of the bar 7) above the top face of the wheel, out of the way. The'sleeve 2 is then raised by means of lever 17, or bearing is lowered by means of lever lei, so that said bearing 10 is-released therefrom to allow the upper end of spindle- 5. to run'loosely or wabble if necessary. The friction wheels '34 being now engaged by the annular groove 4 of the bearing plate 3 and the arbor 5 being inl'apid rotation any unevenness in the weight or any unbalance of the wheel will cause said wheel to run toward one side or the other of the groove and turn said friction wheels 84 and the screw-shaft 33, which, through the worm wheels 32,. turn screws 30 and thus operates to slide the balancing ring toward the point of equilibrium. When this point is reached and the wheel is perfectly balanced device to be balanced, an adjustable weight .adapted to bear upon one side or the other tithe rollers or wheels 3e will run true in the groove, 4 and will therefore not be rotated by frictional contact. The machine will then be stopped and plate 26 tightened against the outer face of ring 25 by means of the screws 27 so as to clamp said balancing ring in this exact position thus insuring a perfectly balanced and true grinding wheel. The grinding wheel when put into use is put on the grinding machine spindle in the same manner that it is mounted upon the spindle 5 the projecting flange 0 serving to protect the friction wheels 34 and also as a dust and water guard for the bearing.

lVhile I have shown the diamonding tool on the machine, and regard it as of special advantage in the apparatus as it enables the Wheel to be first tried and dressed and then balanced, it will be understood, of course, that the balancing mechanism may be used independently.

When it is desired to have the top of spindle .5 held rigid, as for testing after balancing, bearinglO may he slid upward by lever 14: toengage the tapered face of flange 13 with the tapered inner face of sleeve 2, which will secure the result withoutdropping bearing 3 out of engagement with wheels 34,-as will be readily seen.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is: 1.- A balancing machine comprising a rotary arbor formed in two parts connected by a flexible joint, means whereby said jointed part may beheld ri id or allowed to wabble, the part to be ba anced mounted on said arbor, a balancing ring in said part, means for adjusting said balancing ring, and a connection between said means and a bearing around said arbor, substantially as set forth. 2. A balancing'mechanism comprising the carried by the device to be balanced, means for adjusting said weight, a rotary part carrying said device to be balanced, a bear-' ing surrounding the axis thereof, and a connection between the means for ad usting said weight and said bearing, whereby sa d means is operated, substantially as set forth.

3. A balancing mechanism comprising the partto be balanced,-a weight carried by said part and mounted to be adjustable in relation to its axis, means for securing and adjusting said weight, a rotary part on which said part to be balanced is mounted, a fr1ctional bearing surrounding the axis thereof, and friction wheels connected with the means for adjusting said weight mounted in I said frictional bearing, said wheels being of said bearing according'to the unbalance of the part to be balanced, substantially as set forth.

4. A balancing mechanism comprising the part to be balanced, a shiftable solid weight 7 part to be balanced, and means for autoinatically and mechanically adjusting said weight to the point of the equilibrium by the rotary motion of said part, substantially as set forth. 5. A balancing mechanism comprising the part to be balanced, a shiftable weight carried thereby, means for revolving said part to be balanced, and means operated by the rotary motion for mechanically adjusting said shiftable weight bodily, substantially as set forth.

6. A balancing mechanism comprising the part to be balanced, a weight carried by said part to be balanced,'means for mechanically adjusting said weight radially on said part, means for revolving said part, and means for operating the adjusting mechinism, substantially as set forth.

7 A balancing mechanism comprising the part to be balanced, means for revolving said part, a shiftable weight carried by said part, means for shifting said weight bodily in relation to the axis of said part, and means, for operating the shiftingmechanism arranged to be operated by the rotary motion and inequilibrium of said part, sub stantially as set forth.

8. A balancing mechanism comprising the part to be balanced, a weight carried by said part and mounted to be secured and adjusted thereon by screws, and means for operating said screws by the rotary motion and inequilibrium of said part,- substantially as set forth.

ance of the part to be balanced will operate said screws to slide the weight to the point of equilibrium, substantially as set forth.

10. A balancing mechanism comprising the part to be balanced, a movable solid I weight mounted thereon, means for automatically moving said weight to'thepoint of equilibrium, said means being operated .by the,rotary motion of said part, substantially'as set forth.

11. A balancing mechanism comprising the part to be balanced, a movable weight carried by said part and connected .therewith by sliding connections running at right angles with oach other, screws for holding and adjustin" said weight, a worm ,gear and 'screw-sha for operating said screws, means for imparting a rotary motion to said part to be balanced, and a frictional contact between said screw-shafts and a bearing around the axis of the machine,-

substantially as set forth.

12. A balancing mechanism comprising the'pa rt to,b'e balanced, an annular weight surrounding the axis of the partto be balanced and connected therewith by sliding connections, a screw-and-worm gear for adjusting said part, means for ad usting said weight, means for'imparting rotary motion to said part and a frictional engagement between said gear and a bearing surrounding the axis of the machine, substantially as set forth.

13. A balancing mechanism comprising the part to be balanced, an annular weight mounted around the axis thereof to be moved in any direction thereon, means for imparting a rotary motion to'said part to be balanced, and means for moving said annular Weight .to the point of equilibrium by the rotary'motion of said part, substantially as set forth.

14. A balancing mechanism comprising the part to be balanced, a balancingweight mounted to move thereon, mechanism for positively moving said weight by the rotary motion thereof, means for imparting the rotary motion,and means for securing said weight in adjusted position, substantially as set forth. 1 a

i 15. A balancing mechanism 1, comprising the part to be balanced, a movable weight mounted thereon, means' for moving said -weight by the rotary motion of said part, means for imparting a rotary motion to said part comprising a vertical spindle adapted to receive said part on its upper end, said upper end being mounted in a bearing adapted to be held rigid or left 'free to vibrate, substantially as set forth.

16. A balancing mechanism comprising the part to be balanced mounted on a vertical spindle, said spindle formed jointed and arranged with its upper end to wabble, a balancing weight mounted to slide on said part to be balanced, means for sliding said weight to the point of equilibrium and means for operating said sliding part arranged to be operated by'the rotary motion of said part, substantially as set forth.

17. A' balancing mechanism comprising the part to be balanced mounted on a vertical spindle, said vertical spindle formed intwo parts connected by a universal joint :the upper end of said spindle being mountiggh in a box, adjustable means for securing said box or leaving it free to vibrate, a

balancing weight movably connected with stantally as set forth.

18. A balancing mechanism comprising a vertical spindle, a part to be balanced mounted on the upper end thereof, a bearing box mounted around the upper end of said spindle and arranged to be secured or allowed to vibrate, a grooved bearing ring encircling the upper-end of said spindle, a

balancing Weight connected with said part to be balanced, mechanism for moving said balancing weight tothe point of equilibrium, and a friction connection between mounted on its upper end,'an upper bearingbox for said spindle, means for securing said bearing box in a steady osition or in a position to vibrate, means or imparting rotary motion to said spindle, the balancing mechanism connected with said part to be balanced, and means for operating said balancin mechanism by frictional contact operate by the rotary motion and unbalance of the part to be balanced, substantially as set forth. a

a rotary part, a artto be balanced mounted thereon, a s iiftable balancing weight carried by said part to be balanced, means for shifting said balancing weight in relation to the axis of said part to be balanced,

and a connection between said means and a bearing surrounding the axis of the spindle, whereby the same is operated by the rotary 20. A balancing mechanism comprising motion and unbalance of said part, s11bstan tially as set forth.

In witness whereof, I have hereunto set my hand and seal at Washington, District ofColumbia, this 5th day of February,

-A. D. nineteen hundred and ten,

ABRAHAM B. LANDIS.

Witnesses:

J. D. YoAKLEY, E. W. BRADFORD. 

